/**********************************************************************
 *
 * StackWalker.cpp
 * https://github.com/JochenKalmbach/StackWalker
 *
 * Old location: http://stackwalker.codeplex.com/
 *
 *
 * History:
 *  2005-07-27   v1    - First public release on http://www.codeproject.com/
 *                       http://www.codeproject.com/threads/StackWalker.asp
 *  2005-07-28   v2    - Changed the params of the constructor and ShowCallstack
 *                       (to simplify the usage)
 *  2005-08-01   v3    - Changed to use 'CONTEXT_FULL' instead of CONTEXT_ALL
 *                       (should also be enough)
 *                     - Changed to compile correctly with the PSDK of VC7.0
 *                       (GetFileVersionInfoSizeA and GetFileVersionInfoA is wrongly defined:
 *                        it uses LPSTR instead of LPCSTR as first parameter)
 *                     - Added declarations to support VC5/6 without using 'dbghelp.h'
 *                     - Added a 'pUserData' member to the ShowCallstack function and the
 *                       PReadProcessMemoryRoutine declaration (to pass some user-defined data,
 *                       which can be used in the readMemoryFunction-callback)
 *  2005-08-02   v4    - OnSymInit now also outputs the OS-Version by default
 *                     - Added example for doing an exception-callstack-walking in main.cpp
 *                       (thanks to owillebo: http://www.codeproject.com/script/profile/whos_who.asp?id=536268)
 *  2005-08-05   v5    - Removed most Lint (http://www.gimpel.com/) errors... thanks to Okko Willeboordse!
 *  2008-08-04   v6    - Fixed Bug: Missing LEAK-end-tag
 *                       http://www.codeproject.com/KB/applications/leakfinder.aspx?msg=2502890#xx2502890xx
 *                       Fixed Bug: Compiled with "WIN32_LEAN_AND_MEAN"
 *                       http://www.codeproject.com/KB/applications/leakfinder.aspx?msg=1824718#xx1824718xx
 *                       Fixed Bug: Compiling with "/Wall"
 *                       http://www.codeproject.com/KB/threads/StackWalker.aspx?msg=2638243#xx2638243xx
 *                       Fixed Bug: Now checking SymUseSymSrv
 *                       http://www.codeproject.com/KB/threads/StackWalker.aspx?msg=1388979#xx1388979xx
 *                       Fixed Bug: Support for recursive function calls
 *                       http://www.codeproject.com/KB/threads/StackWalker.aspx?msg=1434538#xx1434538xx
 *                       Fixed Bug: Missing FreeLibrary call in "GetModuleListTH32"
 *                       http://www.codeproject.com/KB/threads/StackWalker.aspx?msg=1326923#xx1326923xx
 *                       Fixed Bug: SymDia is number 7, not 9!
 *  2008-09-11   v7      For some (undocumented) reason, dbhelp.h is needing a packing of 8!
 *                       Thanks to Teajay which reported the bug...
 *                       http://www.codeproject.com/KB/applications/leakfinder.aspx?msg=2718933#xx2718933xx
 *  2008-11-27   v8      Debugging Tools for Windows are now stored in a different directory
 *                       Thanks to Luiz Salamon which reported this "bug"...
 *                       http://www.codeproject.com/KB/threads/StackWalker.aspx?msg=2822736#xx2822736xx
 *  2009-04-10   v9      License slightly corrected (<ORGANIZATION> replaced)
 *  2009-11-01   v10     Moved to http://stackwalker.codeplex.com/
 *  2009-11-02   v11     Now try to use IMAGEHLP_MODULE64_V3 if available
 *  2010-04-15   v12     Added support for VS2010 RTM
 *  2010-05-25   v13     Now using secure MyStrcCpy. Thanks to luke.simon:
 *                       http://www.codeproject.com/KB/applications/leakfinder.aspx?msg=3477467#xx3477467xx
 *  2013-01-07   v14     Runtime Check Error VS2010 Debug Builds fixed:
 *                       http://stackwalker.codeplex.com/workitem/10511
 *
 *
 * LICENSE (http://www.opensource.org/licenses/bsd-license.php)
 *
 *   Copyright (c) 2005-2013, Jochen Kalmbach
 *   All rights reserved.
 *
 *   Redistribution and use in source and binary forms, with or without modification,
 *   are permitted provided that the following conditions are met:
 *
 *   Redistributions of source code must retain the above copyright notice,
 *   this list of conditions and the following disclaimer.
 *   Redistributions in binary form must reproduce the above copyright notice,
 *   this list of conditions and the following disclaimer in the documentation
 *   and/or other materials provided with the distribution.
 *   Neither the name of Jochen Kalmbach nor the names of its contributors may be
 *   used to endorse or promote products derived from this software without
 *   specific prior written permission.
 *   THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 *   AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
 *   THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 *   ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE
 *   FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
 *   (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
 *   LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
 *   ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 *   (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
 *   SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 *
 **********************************************************************/

#ifdef _WIN32

#include "StackWalker.h"

#include <stdio.h>
#include <stdlib.h>
#include <tchar.h>
#include <windows.h>
#pragma comment(lib, "version.lib") // for "VerQueryValue"
#pragma warning(disable : 4826)


 // If VC7 and later, then use the shipped 'dbghelp.h'-file
#pragma pack(push, 8)
#if _MSC_VER >= 1300
#include <dbghelp.h>
#else
// inline the important dbghelp.h-declarations...
typedef enum
{
	SymNone = 0,
	SymCoff,
	SymCv,
	SymPdb,
	SymExport,
	SymDeferred,
	SymSym,
	SymDia,
	SymVirtual,
	NumSymTypes
} SYM_TYPE;
typedef struct _IMAGEHLP_LINE64
{
	DWORD   SizeOfStruct; // set to sizeof(IMAGEHLP_LINE64)
	PVOID   Key;          // internal
	DWORD   LineNumber;   // line number in file
	PCHAR   FileName;     // full filename
	DWORD64 Address;      // first instruction of line
} IMAGEHLP_LINE64, *PIMAGEHLP_LINE64;
typedef struct _IMAGEHLP_MODULE64
{
	DWORD    SizeOfStruct;         // set to sizeof(IMAGEHLP_MODULE64)
	DWORD64  BaseOfImage;          // base load address of module
	DWORD    ImageSize;            // virtual size of the loaded module
	DWORD    TimeDateStamp;        // date/time stamp from pe header
	DWORD    CheckSum;             // checksum from the pe header
	DWORD    NumSyms;              // number of symbols in the symbol table
	SYM_TYPE SymType;              // type of symbols loaded
	CHAR     ModuleName[32];       // module name
	CHAR     ImageName[256];       // image name
	CHAR     LoadedImageName[256]; // symbol file name
} IMAGEHLP_MODULE64, *PIMAGEHLP_MODULE64;
typedef struct _IMAGEHLP_SYMBOL64
{
	DWORD   SizeOfStruct;  // set to sizeof(IMAGEHLP_SYMBOL64)
	DWORD64 Address;       // virtual address including dll base address
	DWORD   Size;          // estimated size of symbol, can be zero
	DWORD   Flags;         // info about the symbols, see the SYMF defines
	DWORD   MaxNameLength; // maximum size of symbol name in 'Name'
	CHAR    Name[1];       // symbol name (null terminated string)
} IMAGEHLP_SYMBOL64, *PIMAGEHLP_SYMBOL64;
typedef enum
{
	AddrMode1616,
	AddrMode1632,
	AddrModeReal,
	AddrModeFlat
} ADDRESS_MODE;
typedef struct _tagADDRESS64
{
	DWORD64      Offset;
	WORD         Segment;
	ADDRESS_MODE Mode;
} ADDRESS64, *LPADDRESS64;
typedef struct _KDHELP64
{
	DWORD64 Thread;
	DWORD   ThCallbackStack;
	DWORD   ThCallbackBStore;
	DWORD   NextCallback;
	DWORD   FramePointer;
	DWORD64 KiCallUserMode;
	DWORD64 KeUserCallbackDispatcher;
	DWORD64 SystemRangeStart;
	DWORD64 Reserved[8];
} KDHELP64, *PKDHELP64;
typedef struct _tagSTACKFRAME64
{
	ADDRESS64 AddrPC;         // program counter
	ADDRESS64 AddrReturn;     // return address
	ADDRESS64 AddrFrame;      // frame pointer
	ADDRESS64 AddrStack;      // stack pointer
	ADDRESS64 AddrBStore;     // backing store pointer
	PVOID     FuncTableEntry; // pointer to pdata/fpo or NULL
	DWORD64   Params[4];      // possible arguments to the function
	BOOL      Far;            // WOW far call
	BOOL      Virtual;        // is this a virtual frame?
	DWORD64   Reserved[3];
	KDHELP64  KdHelp;
} STACKFRAME64, *LPSTACKFRAME64;
typedef BOOL(__stdcall* PREAD_PROCESS_MEMORY_ROUTINE64)(HANDLE  hProcess,
	DWORD64 qwBaseAddress,
	PVOID   lpBuffer,
	DWORD   nSize,
	LPDWORD lpNumberOfBytesRead);
typedef PVOID(__stdcall* PFUNCTION_TABLE_ACCESS_ROUTINE64)(HANDLE hProcess, DWORD64 AddrBase);
typedef DWORD64(__stdcall* PGET_MODULE_BASE_ROUTINE64)(HANDLE hProcess, DWORD64 Address);
typedef DWORD64(__stdcall* PTRANSLATE_ADDRESS_ROUTINE64)(HANDLE      hProcess,
	HANDLE      hThread,
	LPADDRESS64 lpaddr);

// clang-format off
#define SYMOPT_CASE_INSENSITIVE         0x00000001
#define SYMOPT_UNDNAME                  0x00000002
#define SYMOPT_DEFERRED_LOADS           0x00000004
#define SYMOPT_NO_CPP                   0x00000008
#define SYMOPT_LOAD_LINES               0x00000010
#define SYMOPT_OMAP_FIND_NEAREST        0x00000020
#define SYMOPT_LOAD_ANYTHING            0x00000040
#define SYMOPT_IGNORE_CVREC             0x00000080
#define SYMOPT_NO_UNQUALIFIED_LOADS     0x00000100
#define SYMOPT_FAIL_CRITICAL_ERRORS     0x00000200
#define SYMOPT_EXACT_SYMBOLS            0x00000400
#define SYMOPT_ALLOW_ABSOLUTE_SYMBOLS   0x00000800
#define SYMOPT_IGNORE_NT_SYMPATH        0x00001000
#define SYMOPT_INCLUDE_32BIT_MODULES    0x00002000
#define SYMOPT_PUBLICS_ONLY             0x00004000
#define SYMOPT_NO_PUBLICS               0x00008000
#define SYMOPT_AUTO_PUBLICS             0x00010000
#define SYMOPT_NO_IMAGE_SEARCH          0x00020000
#define SYMOPT_SECURE                   0x00040000
#define SYMOPT_DEBUG                    0x80000000
#define UNDNAME_COMPLETE                 (0x0000) // Enable full undecoration
#define UNDNAME_NAME_ONLY                (0x1000) // Crack only the name for primary declaration;
// clang-format on

#endif // _MSC_VER < 1300
#pragma pack(pop)

// Some missing defines (for VC5/6):
#ifndef INVALID_FILE_ATTRIBUTES
#define INVALID_FILE_ATTRIBUTES ((DWORD)-1)
#endif

// secure-CRT_functions are only available starting with VC8
#if _MSC_VER < 1400
#define strcpy_s(dst, len, src) strcpy(dst, src)
#define strncpy_s(dst, len, src, maxLen) strncpy(dst, len, src)
#define strcat_s(dst, len, src) strcat(dst, src)
#define _snprintf_s _snprintf
#define _tcscat_s _tcscat
#endif

static void MyStrCpy(char* szDest, size_t nMaxDestSize, const char* szSrc)
{
	if (nMaxDestSize <= 0)
		return;
	strncpy_s(szDest, nMaxDestSize, szSrc, _TRUNCATE);
	// INFO: _TRUNCATE will ensure that it is null-terminated;
	// but with older compilers (<1400) it uses "strncpy" and this does not!)
	szDest[nMaxDestSize - 1] = 0;
} // MyStrCpy

// Normally it should be enough to use 'CONTEXT_FULL' (better would be 'CONTEXT_ALL')
#define USED_CONTEXT_FLAGS CONTEXT_FULL

class StackWalkerInternal
{
public:
	StackWalkerInternal(StackWalker* parent, HANDLE hProcess)
	{
		m_parent = parent;
		m_hDbhHelp = NULL;
		pSC = NULL;
		m_hProcess = hProcess;
		m_szSymPath = NULL;
		pSFTA = NULL;
		pSGLFA = NULL;
		pSGMB = NULL;
		pSGMI = NULL;
		pSGO = NULL;
		pSGSFA = NULL;
		pSI = NULL;
		pSLM = NULL;
		pSSO = NULL;
		pSW = NULL;
		pUDSN = NULL;
		pSGSP = NULL;
	}
	~StackWalkerInternal()
	{
		if (pSC != NULL)
			pSC(m_hProcess); // SymCleanup
		if (m_hDbhHelp != NULL)
			FreeLibrary(m_hDbhHelp);
		m_hDbhHelp = NULL;
		m_parent = NULL;
		if (m_szSymPath != NULL)
			free(m_szSymPath);
		m_szSymPath = NULL;
	}
	BOOL Init(LPCSTR szSymPath)
	{
		if (m_parent == NULL)
			return FALSE;
		// Dynamically load the Entry-Points for dbghelp.dll:
		// First try to load the newest one from
		TCHAR szTemp[4096];
		// But before we do this, we first check if the ".local" file exists
		if (GetModuleFileName(NULL, szTemp, 4096) > 0)
		{
			_tcscat_s(szTemp, _T(".local"));
			if (GetFileAttributes(szTemp) == INVALID_FILE_ATTRIBUTES)
			{
				// ".local" file does not exist, so we can try to load the dbghelp.dll from the "Debugging Tools for Windows"
				// Ok, first try the new path according to the architecture:
#ifdef _M_IX86
				if ((m_hDbhHelp == NULL) && (GetEnvironmentVariable(_T("ProgramFiles"), szTemp, 4096) > 0))
				{
					_tcscat_s(szTemp, _T("\\Debugging Tools for Windows (x86)\\dbghelp.dll"));
					// now check if the file exists:
					if (GetFileAttributes(szTemp) != INVALID_FILE_ATTRIBUTES)
					{
						m_hDbhHelp = LoadLibrary(szTemp);
					}
				}
#elif _M_X64
				if ((m_hDbhHelp == NULL) && (GetEnvironmentVariable(_T("ProgramFiles"), szTemp, 4096) > 0))
				{
					_tcscat_s(szTemp, _T("\\Debugging Tools for Windows (x64)\\dbghelp.dll"));
					// now check if the file exists:
					if (GetFileAttributes(szTemp) != INVALID_FILE_ATTRIBUTES)
					{
						m_hDbhHelp = LoadLibrary(szTemp);
					}
				}
#elif _M_IA64
				if ((m_hDbhHelp == NULL) && (GetEnvironmentVariable(_T("ProgramFiles"), szTemp, 4096) > 0))
				{
					_tcscat_s(szTemp, _T("\\Debugging Tools for Windows (ia64)\\dbghelp.dll"));
					// now check if the file exists:
					if (GetFileAttributes(szTemp) != INVALID_FILE_ATTRIBUTES)
					{
						m_hDbhHelp = LoadLibrary(szTemp);
					}
				}
#endif
				// If still not found, try the old directories...
				if ((m_hDbhHelp == NULL) && (GetEnvironmentVariable(_T("ProgramFiles"), szTemp, 4096) > 0))
				{
					_tcscat_s(szTemp, _T("\\Debugging Tools for Windows\\dbghelp.dll"));
					// now check if the file exists:
					if (GetFileAttributes(szTemp) != INVALID_FILE_ATTRIBUTES)
					{
						m_hDbhHelp = LoadLibrary(szTemp);
					}
				}
#if defined _M_X64 || defined _M_IA64
				// Still not found? Then try to load the (old) 64-Bit version:
				if ((m_hDbhHelp == NULL) && (GetEnvironmentVariable(_T("ProgramFiles"), szTemp, 4096) > 0))
				{
					_tcscat_s(szTemp, _T("\\Debugging Tools for Windows 64-Bit\\dbghelp.dll"));
					if (GetFileAttributes(szTemp) != INVALID_FILE_ATTRIBUTES)
					{
						m_hDbhHelp = LoadLibrary(szTemp);
					}
				}
#endif
			}
		}
		if (m_hDbhHelp == NULL) // if not already loaded, try to load a default-one
			m_hDbhHelp = LoadLibrary(_T("dbghelp.dll"));
		if (m_hDbhHelp == NULL)
			return FALSE;
		pSI = (tSI)GetProcAddress(m_hDbhHelp, "SymInitialize");
		pSC = (tSC)GetProcAddress(m_hDbhHelp, "SymCleanup");

		pSW = (tSW)GetProcAddress(m_hDbhHelp, "StackWalk64");
		pSGO = (tSGO)GetProcAddress(m_hDbhHelp, "SymGetOptions");
		pSSO = (tSSO)GetProcAddress(m_hDbhHelp, "SymSetOptions");

		pSFTA = (tSFTA)GetProcAddress(m_hDbhHelp, "SymFunctionTableAccess64");
		pSGLFA = (tSGLFA)GetProcAddress(m_hDbhHelp, "SymGetLineFromAddr64");
		pSGMB = (tSGMB)GetProcAddress(m_hDbhHelp, "SymGetModuleBase64");
		pSGMI = (tSGMI)GetProcAddress(m_hDbhHelp, "SymGetModuleInfo64");
		pSGSFA = (tSGSFA)GetProcAddress(m_hDbhHelp, "SymGetSymFromAddr64");
		pUDSN = (tUDSN)GetProcAddress(m_hDbhHelp, "UnDecorateSymbolName");
		pSLM = (tSLM)GetProcAddress(m_hDbhHelp, "SymLoadModule64");
		pSGSP = (tSGSP)GetProcAddress(m_hDbhHelp, "SymGetSearchPath");

		if (pSC == NULL || pSFTA == NULL || pSGMB == NULL || pSGMI == NULL || pSGO == NULL ||
			pSGSFA == NULL || pSI == NULL || pSSO == NULL || pSW == NULL || pUDSN == NULL ||
			pSLM == NULL)
		{
			FreeLibrary(m_hDbhHelp);
			m_hDbhHelp = NULL;
			pSC = NULL;
			return FALSE;
		}

		// SymInitialize
		if (szSymPath != NULL)
			m_szSymPath = _strdup(szSymPath);
		if (this->pSI(m_hProcess, m_szSymPath, FALSE) == FALSE)
			this->m_parent->OnDbgHelpErr("SymInitialize", GetLastError(), 0);

		DWORD symOptions = this->pSGO(); // SymGetOptions
		symOptions |= SYMOPT_LOAD_LINES;
		symOptions |= SYMOPT_FAIL_CRITICAL_ERRORS;
		//symOptions |= SYMOPT_NO_PROMPTS;
		// SymSetOptions
		symOptions = this->pSSO(symOptions);

		char buf[StackWalker::STACKWALK_MAX_NAMELEN] = { 0 };
		if (this->pSGSP != NULL)
		{
			if (this->pSGSP(m_hProcess, buf, StackWalker::STACKWALK_MAX_NAMELEN) == FALSE)
				this->m_parent->OnDbgHelpErr("SymGetSearchPath", GetLastError(), 0);
		}
		char  szUserName[1024] = { 0 };
		DWORD dwSize = 1024;
		GetUserNameA(szUserName, &dwSize);
		this->m_parent->OnSymInit(buf, symOptions, szUserName);

		return TRUE;
	}

	StackWalker* m_parent;

	HMODULE m_hDbhHelp;
	HANDLE  m_hProcess;
	LPSTR   m_szSymPath;

#pragma pack(push, 8)
	typedef struct IMAGEHLP_MODULE64_V3
	{
		DWORD    SizeOfStruct;         // set to sizeof(IMAGEHLP_MODULE64)
		DWORD64  BaseOfImage;          // base load address of module
		DWORD    ImageSize;            // virtual size of the loaded module
		DWORD    TimeDateStamp;        // date/time stamp from pe header
		DWORD    CheckSum;             // checksum from the pe header
		DWORD    NumSyms;              // number of symbols in the symbol table
		SYM_TYPE SymType;              // type of symbols loaded
		CHAR     ModuleName[32];       // module name
		CHAR     ImageName[256];       // image name
		CHAR     LoadedImageName[256]; // symbol file name
		// new elements: 07-Jun-2002
		CHAR  LoadedPdbName[256];   // pdb file name
		DWORD CVSig;                // Signature of the CV record in the debug directories
		CHAR  CVData[MAX_PATH * 3]; // Contents of the CV record
		DWORD PdbSig;               // Signature of PDB
		GUID  PdbSig70;             // Signature of PDB (VC 7 and up)
		DWORD PdbAge;               // DBI age of pdb
		BOOL  PdbUnmatched;         // loaded an unmatched pdb
		BOOL  DbgUnmatched;         // loaded an unmatched dbg
		BOOL  LineNumbers;          // we have line number information
		BOOL  GlobalSymbols;        // we have internal symbol information
		BOOL  TypeInfo;             // we have type information
		// new elements: 17-Dec-2003
		BOOL SourceIndexed; // pdb supports source server
		BOOL Publics;       // contains public symbols
	};

	typedef struct IMAGEHLP_MODULE64_V2
	{
		DWORD    SizeOfStruct;         // set to sizeof(IMAGEHLP_MODULE64)
		DWORD64  BaseOfImage;          // base load address of module
		DWORD    ImageSize;            // virtual size of the loaded module
		DWORD    TimeDateStamp;        // date/time stamp from pe header
		DWORD    CheckSum;             // checksum from the pe header
		DWORD    NumSyms;              // number of symbols in the symbol table
		SYM_TYPE SymType;              // type of symbols loaded
		CHAR     ModuleName[32];       // module name
		CHAR     ImageName[256];       // image name
		CHAR     LoadedImageName[256]; // symbol file name
	};
#pragma pack(pop)

	// SymCleanup()
	typedef BOOL(__stdcall* tSC)(IN HANDLE hProcess);
	tSC pSC;

	// SymFunctionTableAccess64()
	typedef PVOID(__stdcall* tSFTA)(HANDLE hProcess, DWORD64 AddrBase);
	tSFTA pSFTA;

	// SymGetLineFromAddr64()
	typedef BOOL(__stdcall* tSGLFA)(IN HANDLE hProcess,
		IN DWORD64 dwAddr,
		OUT PDWORD pdwDisplacement,
		OUT PIMAGEHLP_LINE64 Line);
	tSGLFA pSGLFA;

	// SymGetModuleBase64()
	typedef DWORD64(__stdcall* tSGMB)(IN HANDLE hProcess, IN DWORD64 dwAddr);
	tSGMB pSGMB;

	// SymGetModuleInfo64()
	typedef BOOL(__stdcall* tSGMI)(IN HANDLE hProcess,
		IN DWORD64 dwAddr,
		OUT IMAGEHLP_MODULE64_V3* ModuleInfo);
	tSGMI pSGMI;

	// SymGetOptions()
	typedef DWORD(__stdcall* tSGO)(VOID);
	tSGO pSGO;

	// SymGetSymFromAddr64()
	typedef BOOL(__stdcall* tSGSFA)(IN HANDLE hProcess,
		IN DWORD64 dwAddr,
		OUT PDWORD64 pdwDisplacement,
		OUT PIMAGEHLP_SYMBOL64 Symbol);
	tSGSFA pSGSFA;

	// SymInitialize()
	typedef BOOL(__stdcall* tSI)(IN HANDLE hProcess, IN PSTR UserSearchPath, IN BOOL fInvadeProcess);
	tSI pSI;

	// SymLoadModule64()
	typedef DWORD64(__stdcall* tSLM)(IN HANDLE hProcess,
		IN HANDLE hFile,
		IN PSTR ImageName,
		IN PSTR ModuleName,
		IN DWORD64 BaseOfDll,
		IN DWORD SizeOfDll);
	tSLM pSLM;

	// SymSetOptions()
	typedef DWORD(__stdcall* tSSO)(IN DWORD SymOptions);
	tSSO pSSO;

	// StackWalk64()
	typedef BOOL(__stdcall* tSW)(DWORD                            MachineType,
		HANDLE                           hProcess,
		HANDLE                           hThread,
		LPSTACKFRAME64                   StackFrame,
		PVOID                            ContextRecord,
		PREAD_PROCESS_MEMORY_ROUTINE64   ReadMemoryRoutine,
		PFUNCTION_TABLE_ACCESS_ROUTINE64 FunctionTableAccessRoutine,
		PGET_MODULE_BASE_ROUTINE64       GetModuleBaseRoutine,
		PTRANSLATE_ADDRESS_ROUTINE64     TranslateAddress);
	tSW pSW;

	// UnDecorateSymbolName()
	typedef DWORD(__stdcall WINAPI* tUDSN)(PCSTR DecoratedName,
		PSTR  UnDecoratedName,
		DWORD UndecoratedLength,
		DWORD Flags);
	tUDSN pUDSN;

	typedef BOOL(__stdcall WINAPI* tSGSP)(HANDLE hProcess, PSTR SearchPath, DWORD SearchPathLength);
	tSGSP pSGSP;

private:
	// **************************************** ToolHelp32 ************************
#define MAX_MODULE_NAME32 255
#define TH32CS_SNAPMODULE 0x00000008
#pragma pack(push, 8)
	typedef struct tagMODULEENTRY32
	{
		DWORD   dwSize;
		DWORD   th32ModuleID;  // This module
		DWORD   th32ProcessID; // owning process
		DWORD   GlblcntUsage;  // Global usage count on the module
		DWORD   ProccntUsage;  // Module usage count in th32ProcessID's context
		BYTE*   modBaseAddr;   // Base address of module in th32ProcessID's context
		DWORD   modBaseSize;   // Size in bytes of module starting at modBaseAddr
		HMODULE hModule;       // The hModule of this module in th32ProcessID's context
		char    szModule[MAX_MODULE_NAME32 + 1];
		char    szExePath[MAX_PATH];
	} MODULEENTRY32;
	typedef MODULEENTRY32* PMODULEENTRY32;
	typedef MODULEENTRY32* LPMODULEENTRY32;
#pragma pack(pop)

	BOOL GetModuleListTH32(HANDLE hProcess, DWORD pid)
	{
		// CreateToolhelp32Snapshot()
		typedef HANDLE(__stdcall * tCT32S)(DWORD dwFlags, DWORD th32ProcessID);
		// Module32First()
		typedef BOOL(__stdcall * tM32F)(HANDLE hSnapshot, LPMODULEENTRY32 lpme);
		// Module32Next()
		typedef BOOL(__stdcall * tM32N)(HANDLE hSnapshot, LPMODULEENTRY32 lpme);

		// try both dlls...
		const TCHAR* dllname[] = { _T("kernel32.dll"), _T("tlhelp32.dll") };
		HINSTANCE    hToolhelp = NULL;
		tCT32S       pCT32S = NULL;
		tM32F        pM32F = NULL;
		tM32N        pM32N = NULL;

		HANDLE        hSnap;
		MODULEENTRY32 me;
		me.dwSize = sizeof(me);
		BOOL   keepGoing;
		size_t i;

		for (i = 0; i < (sizeof(dllname) / sizeof(dllname[0])); i++)
		{
			hToolhelp = LoadLibrary(dllname[i]);
			if (hToolhelp == NULL)
				continue;
			pCT32S = (tCT32S)GetProcAddress(hToolhelp, "CreateToolhelp32Snapshot");
			pM32F = (tM32F)GetProcAddress(hToolhelp, "Module32First");
			pM32N = (tM32N)GetProcAddress(hToolhelp, "Module32Next");
			if ((pCT32S != NULL) && (pM32F != NULL) && (pM32N != NULL))
				break; // found the functions!
			FreeLibrary(hToolhelp);
			hToolhelp = NULL;
		}

		if (hToolhelp == NULL)
			return FALSE;

		hSnap = pCT32S(TH32CS_SNAPMODULE, pid);
		if (hSnap == (HANDLE)-1)
		{
			FreeLibrary(hToolhelp);
			return FALSE;
		}

		keepGoing = !!pM32F(hSnap, &me);
		int cnt = 0;
		while (keepGoing)
		{
			this->LoadModule(hProcess, me.szExePath, me.szModule, (DWORD64)me.modBaseAddr,
				me.modBaseSize);
			cnt++;
			keepGoing = !!pM32N(hSnap, &me);
		}
		CloseHandle(hSnap);
		FreeLibrary(hToolhelp);
		if (cnt <= 0)
			return FALSE;
		return TRUE;
	} // GetModuleListTH32

	// **************************************** PSAPI ************************
	typedef struct _MODULEINFO
	{
		LPVOID lpBaseOfDll;
		DWORD  SizeOfImage;
		LPVOID EntryPoint;
	} MODULEINFO, *LPMODULEINFO;

	BOOL GetModuleListPSAPI(HANDLE hProcess)
	{
		// EnumProcessModules()
		typedef BOOL(__stdcall * tEPM)(HANDLE hProcess, HMODULE * lphModule, DWORD cb,
			LPDWORD lpcbNeeded);
		// GetModuleFileNameEx()
		typedef DWORD(__stdcall * tGMFNE)(HANDLE hProcess, HMODULE hModule, LPSTR lpFilename,
			DWORD nSize);
		// GetModuleBaseName()
		typedef DWORD(__stdcall * tGMBN)(HANDLE hProcess, HMODULE hModule, LPSTR lpFilename,
			DWORD nSize);
		// GetModuleInformation()
		typedef BOOL(__stdcall * tGMI)(HANDLE hProcess, HMODULE hModule, LPMODULEINFO pmi, DWORD nSize);

		HINSTANCE hPsapi;
		tEPM      pEPM;
		tGMFNE    pGMFNE;
		tGMBN     pGMBN;
		tGMI      pGMI;

		DWORD i;
		//ModuleEntry e;
		DWORD        cbNeeded;
		MODULEINFO   mi;
		HMODULE*     hMods = 0;
		char*        tt = NULL;
		char*        tt2 = NULL;
		const SIZE_T TTBUFLEN = 8096;
		int          cnt = 0;

		hPsapi = LoadLibrary(_T("psapi.dll"));
		if (hPsapi == NULL)
			return FALSE;

		pEPM = (tEPM)GetProcAddress(hPsapi, "EnumProcessModules");
		pGMFNE = (tGMFNE)GetProcAddress(hPsapi, "GetModuleFileNameExA");
		pGMBN = (tGMFNE)GetProcAddress(hPsapi, "GetModuleBaseNameA");
		pGMI = (tGMI)GetProcAddress(hPsapi, "GetModuleInformation");
		if ((pEPM == NULL) || (pGMFNE == NULL) || (pGMBN == NULL) || (pGMI == NULL))
		{
			// we couldn't find all functions
			FreeLibrary(hPsapi);
			return FALSE;
		}

		hMods = (HMODULE*)malloc(sizeof(HMODULE) * (TTBUFLEN / sizeof(HMODULE)));
		tt = (char*)malloc(sizeof(char) * TTBUFLEN);
		tt2 = (char*)malloc(sizeof(char) * TTBUFLEN);
		if ((hMods == NULL) || (tt == NULL) || (tt2 == NULL))
			goto cleanup;

		if (!pEPM(hProcess, hMods, TTBUFLEN, &cbNeeded))
		{
			//_ftprintf(fLogFile, _T("%lu: EPM failed, GetLastError = %lu\n"), g_dwShowCount, gle );
			goto cleanup;
		}

		if (cbNeeded > TTBUFLEN)
		{
			//_ftprintf(fLogFile, _T("%lu: More than %lu module handles. Huh?\n"), g_dwShowCount, lenof( hMods ) );
			goto cleanup;
		}

		for (i = 0; i < cbNeeded / sizeof(hMods[0]); i++)
		{
			// base address, size
			pGMI(hProcess, hMods[i], &mi, sizeof(mi));
			// image file name
			tt[0] = 0;
			pGMFNE(hProcess, hMods[i], tt, TTBUFLEN);
			// module name
			tt2[0] = 0;
			pGMBN(hProcess, hMods[i], tt2, TTBUFLEN);

			DWORD dwRes = this->LoadModule(hProcess, tt, tt2, (DWORD64)mi.lpBaseOfDll, mi.SizeOfImage);
			if (dwRes != ERROR_SUCCESS)
				this->m_parent->OnDbgHelpErr("LoadModule", dwRes, 0);
			cnt++;
		}

	cleanup:
		if (hPsapi != NULL)
			FreeLibrary(hPsapi);
		if (tt2 != NULL)
			free(tt2);
		if (tt != NULL)
			free(tt);
		if (hMods != NULL)
			free(hMods);

		return cnt != 0;
	} // GetModuleListPSAPI

	DWORD LoadModule(HANDLE hProcess, LPCSTR img, LPCSTR mod, DWORD64 baseAddr, DWORD size)
	{
		CHAR* szImg = _strdup(img);
		CHAR* szMod = _strdup(mod);
		DWORD result = ERROR_SUCCESS;
		if ((szImg == NULL) || (szMod == NULL))
			result = ERROR_NOT_ENOUGH_MEMORY;
		else
		{
			if (pSLM(hProcess, 0, szImg, szMod, baseAddr, size) == 0)
				result = GetLastError();
		}
		ULONGLONG fileVersion = 0;
		if ((m_parent != NULL) && (szImg != NULL))
		{
			// try to retrieve the file-version:
			if ((this->m_parent->m_options & StackWalker::RetrieveFileVersion) != 0)
			{
				VS_FIXEDFILEINFO* fInfo = NULL;
				DWORD             dwHandle;
				DWORD             dwSize = GetFileVersionInfoSizeA(szImg, &dwHandle);
				if (dwSize > 0)
				{
					LPVOID vData = malloc(dwSize);
					if (vData != NULL)
					{
						if (GetFileVersionInfoA(szImg, dwHandle, dwSize, vData) != 0)
						{
							UINT  len;
							TCHAR szSubBlock[] = _T("\\");
							if (VerQueryValue(vData, szSubBlock, (LPVOID*)&fInfo, &len) == 0)
								fInfo = NULL;
							else
							{
								fileVersion =
									((ULONGLONG)fInfo->dwFileVersionLS) + ((ULONGLONG)fInfo->dwFileVersionMS << 32);
							}
						}
						free(vData);
					}
				}
			}

			// Retrieve some additional-infos about the module
			IMAGEHLP_MODULE64_V3 Module;
			const char*          szSymType = "-unknown-";
			if (this->GetModuleInfo(hProcess, baseAddr, &Module) != FALSE)
			{
				switch (Module.SymType)
				{
				case SymNone:
					szSymType = "-nosymbols-";
					break;
				case SymCoff: // 1
					szSymType = "COFF";
					break;
				case SymCv: // 2
					szSymType = "CV";
					break;
				case SymPdb: // 3
					szSymType = "PDB";
					break;
				case SymExport: // 4
					szSymType = "-exported-";
					break;
				case SymDeferred: // 5
					szSymType = "-deferred-";
					break;
				case SymSym: // 6
					szSymType = "SYM";
					break;
				case 7: // SymDia:
					szSymType = "DIA";
					break;
				case 8: //SymVirtual:
					szSymType = "Virtual";
					break;
				}
			}
			LPCSTR pdbName = Module.LoadedImageName;
			if (Module.LoadedPdbName[0] != 0)
				pdbName = Module.LoadedPdbName;
			this->m_parent->OnLoadModule(img, mod, baseAddr, size, result, szSymType, pdbName,
				fileVersion);
		}
		if (szImg != NULL)
			free(szImg);
		if (szMod != NULL)
			free(szMod);
		return result;
	}

public:
	BOOL LoadModules(HANDLE hProcess, DWORD dwProcessId)
	{
		// first try toolhelp32
		if (GetModuleListTH32(hProcess, dwProcessId))
			return true;
		// then try psapi
		return GetModuleListPSAPI(hProcess);
	}

	BOOL GetModuleInfo(HANDLE hProcess, DWORD64 baseAddr, IMAGEHLP_MODULE64_V3* pModuleInfo)
	{
		memset(pModuleInfo, 0, sizeof(IMAGEHLP_MODULE64_V3));
		if (this->pSGMI == NULL)
		{
			SetLastError(ERROR_DLL_INIT_FAILED);
			return FALSE;
		}
		// First try to use the larger ModuleInfo-Structure
		pModuleInfo->SizeOfStruct = sizeof(IMAGEHLP_MODULE64_V3);
		void* pData = malloc(
			4096); // reserve enough memory, so the bug in v6.3.5.1 does not lead to memory-overwrites...
		if (pData == NULL)
		{
			SetLastError(ERROR_NOT_ENOUGH_MEMORY);
			return FALSE;
		}
		memcpy(pData, pModuleInfo, sizeof(IMAGEHLP_MODULE64_V3));
		static bool s_useV3Version = true;
		if (s_useV3Version)
		{
			if (this->pSGMI(hProcess, baseAddr, (IMAGEHLP_MODULE64_V3*)pData) != FALSE)
			{
				// only copy as much memory as is reserved...
				memcpy(pModuleInfo, pData, sizeof(IMAGEHLP_MODULE64_V3));
				pModuleInfo->SizeOfStruct = sizeof(IMAGEHLP_MODULE64_V3);
				free(pData);
				return TRUE;
			}
			s_useV3Version = false; // to prevent unnecessary calls with the larger struct...
		}

		// could not retrieve the bigger structure, try with the smaller one (as defined in VC7.1)...
		pModuleInfo->SizeOfStruct = sizeof(IMAGEHLP_MODULE64_V2);
		memcpy(pData, pModuleInfo, sizeof(IMAGEHLP_MODULE64_V2));
		if (this->pSGMI(hProcess, baseAddr, (IMAGEHLP_MODULE64_V3*)pData) != FALSE)
		{
			// only copy as much memory as is reserved...
			memcpy(pModuleInfo, pData, sizeof(IMAGEHLP_MODULE64_V2));
			pModuleInfo->SizeOfStruct = sizeof(IMAGEHLP_MODULE64_V2);
			free(pData);
			return TRUE;
		}
		free(pData);
		SetLastError(ERROR_DLL_INIT_FAILED);
		return FALSE;
	}
};

// #############################################################
StackWalker::StackWalker(WalkerLogger logger, DWORD dwProcessId, HANDLE hProcess)
	: m_logger(logger)
{
	this->m_options = OptionsAll;
	this->m_modulesLoaded = FALSE;
	this->m_hProcess = hProcess;
	this->m_sw = new StackWalkerInternal(this, this->m_hProcess);
	this->m_dwProcessId = dwProcessId;
	this->m_szSymPath = NULL;
	this->m_MaxRecursionCount = 1000;
}
StackWalker::StackWalker(WalkerLogger logger, int options, LPCSTR szSymPath, DWORD dwProcessId, HANDLE hProcess)
	: m_logger(logger)
{
	this->m_options = options;
	this->m_modulesLoaded = FALSE;
	this->m_hProcess = hProcess;
	this->m_sw = new StackWalkerInternal(this, this->m_hProcess);
	this->m_dwProcessId = dwProcessId;
	if (szSymPath != NULL)
	{
		this->m_szSymPath = _strdup(szSymPath);
		this->m_options |= SymBuildPath;
	}
	else
		this->m_szSymPath = NULL;
	this->m_MaxRecursionCount = 1000;
}

StackWalker::~StackWalker()
{
	if (m_szSymPath != NULL)
		free(m_szSymPath);
	m_szSymPath = NULL;
	if (this->m_sw != NULL)
		delete this->m_sw;
	this->m_sw = NULL;
}

BOOL StackWalker::LoadModules()
{
	if (this->m_sw == NULL)
	{
		SetLastError(ERROR_DLL_INIT_FAILED);
		return FALSE;
	}
	if (m_modulesLoaded != FALSE)
		return TRUE;

	// Build the sym-path:
	char* szSymPath = NULL;
	if ((this->m_options & SymBuildPath) != 0)
	{
		const size_t nSymPathLen = 4096;
		szSymPath = (char*)malloc(nSymPathLen);
		if (szSymPath == NULL)
		{
			SetLastError(ERROR_NOT_ENOUGH_MEMORY);
			return FALSE;
		}
		szSymPath[0] = 0;
		// Now first add the (optional) provided sympath:
		if (this->m_szSymPath != NULL)
		{
			strcat_s(szSymPath, nSymPathLen, this->m_szSymPath);
			strcat_s(szSymPath, nSymPathLen, ";");
		}

		strcat_s(szSymPath, nSymPathLen, ".;");

		const size_t nTempLen = 1024;
		char         szTemp[nTempLen];
		// Now add the current directory:
		if (GetCurrentDirectoryA(nTempLen, szTemp) > 0)
		{
			szTemp[nTempLen - 1] = 0;
			strcat_s(szSymPath, nSymPathLen, szTemp);
			strcat_s(szSymPath, nSymPathLen, ";");
		}

		// Now add the path for the main-module:
		if (GetModuleFileNameA(NULL, szTemp, nTempLen) > 0)
		{
			szTemp[nTempLen - 1] = 0;
			for (char* p = (szTemp + strlen(szTemp) - 1); p >= szTemp; --p)
			{
				// locate the rightmost path separator
				if ((*p == '\\') || (*p == '/') || (*p == ':'))
				{
					*p = 0;
					break;
				}
			} // for (search for path separator...)
			if (strlen(szTemp) > 0)
			{
				strcat_s(szSymPath, nSymPathLen, szTemp);
				strcat_s(szSymPath, nSymPathLen, ";");
			}
		}
		if (GetEnvironmentVariableA("_NT_SYMBOL_PATH", szTemp, nTempLen) > 0)
		{
			szTemp[nTempLen - 1] = 0;
			strcat_s(szSymPath, nSymPathLen, szTemp);
			strcat_s(szSymPath, nSymPathLen, ";");
		}
		if (GetEnvironmentVariableA("_NT_ALTERNATE_SYMBOL_PATH", szTemp, nTempLen) > 0)
		{
			szTemp[nTempLen - 1] = 0;
			strcat_s(szSymPath, nSymPathLen, szTemp);
			strcat_s(szSymPath, nSymPathLen, ";");
		}
		if (GetEnvironmentVariableA("SYSTEMROOT", szTemp, nTempLen) > 0)
		{
			szTemp[nTempLen - 1] = 0;
			strcat_s(szSymPath, nSymPathLen, szTemp);
			strcat_s(szSymPath, nSymPathLen, ";");
			// also add the "system32"-directory:
			strcat_s(szTemp, nTempLen, "\\system32");
			strcat_s(szSymPath, nSymPathLen, szTemp);
			strcat_s(szSymPath, nSymPathLen, ";");
		}

		if ((this->m_options & SymUseSymSrv) != 0)
		{
			if (GetEnvironmentVariableA("SYSTEMDRIVE", szTemp, nTempLen) > 0)
			{
				szTemp[nTempLen - 1] = 0;
				strcat_s(szSymPath, nSymPathLen, "SRV*");
				strcat_s(szSymPath, nSymPathLen, szTemp);
				strcat_s(szSymPath, nSymPathLen, "\\websymbols");
				strcat_s(szSymPath, nSymPathLen, "*http://msdl.microsoft.com/download/symbols;");
			}
			else
				strcat_s(szSymPath, nSymPathLen,
					"SRV*c:\\websymbols*http://msdl.microsoft.com/download/symbols;");
		}
	} // if SymBuildPath

	// First Init the whole stuff...
	BOOL bRet = this->m_sw->Init(szSymPath);
	if (szSymPath != NULL)
		free(szSymPath);
	szSymPath = NULL;
	if (bRet == FALSE)
	{
		this->OnDbgHelpErr("Error while initializing dbghelp.dll", 0, 0);
		SetLastError(ERROR_DLL_INIT_FAILED);
		return FALSE;
	}

	bRet = this->m_sw->LoadModules(this->m_hProcess, this->m_dwProcessId);
	if (bRet != FALSE)
		m_modulesLoaded = TRUE;
	return bRet;
}

// The following is used to pass the "userData"-Pointer to the user-provided readMemoryFunction
// This has to be done due to a problem with the "hProcess"-parameter in x64...
// Because this class is in no case multi-threading-enabled (because of the limitations
// of dbghelp.dll) it is "safe" to use a static-variable
static StackWalker::PReadProcessMemoryRoutine s_readMemoryFunction = NULL;
static LPVOID                                 s_readMemoryFunction_UserData = NULL;

BOOL StackWalker::ShowCallstack(HANDLE                    hThread,
	const CONTEXT*            context,
	PReadProcessMemoryRoutine readMemoryFunction,
	LPVOID                    pUserData)
{
	CONTEXT                                   c;
	CallstackEntry                            csEntry;
	IMAGEHLP_SYMBOL64*                        pSym = NULL;
	StackWalkerInternal::IMAGEHLP_MODULE64_V3 Module;
	IMAGEHLP_LINE64                           Line;
	int                                       frameNum;
	bool                                      bLastEntryCalled = true;
	int                                       curRecursionCount = 0;

	if (m_modulesLoaded == FALSE)
		this->LoadModules(); // ignore the result...

	if (this->m_sw->m_hDbhHelp == NULL)
	{
		SetLastError(ERROR_DLL_INIT_FAILED);
		return FALSE;
	}

	s_readMemoryFunction = readMemoryFunction;
	s_readMemoryFunction_UserData = pUserData;

	if (context == NULL)
	{
		// If no context is provided, capture the context
		// See: https://stackwalker.codeplex.com/discussions/446958
#if _WIN32_WINNT <= 0x0501
	// If we need to support XP, we need to use the "old way", because "GetThreadId" is not available!
		if (hThread == GetCurrentThread())
#else
		if (GetThreadId(hThread) == GetCurrentThreadId())
#endif
		{
			GET_CURRENT_CONTEXT_STACKWALKER_CODEPLEX(c, USED_CONTEXT_FLAGS);
		}
		else
		{
			SuspendThread(hThread);
			memset(&c, 0, sizeof(CONTEXT));
			c.ContextFlags = USED_CONTEXT_FLAGS;

			// TODO: Detect if you want to get a thread context of a different process, which is running a different processor architecture...
			// This does only work if we are x64 and the target process is x64 or x86;
			// It cannot work, if this process is x64 and the target process is x64... this is not supported...
			// See also: http://www.howzatt.demon.co.uk/articles/DebuggingInWin64.html
			if (GetThreadContext(hThread, &c) == FALSE)
			{
				ResumeThread(hThread);
				return FALSE;
			}
		}
	}
	else
		c = *context;

	// init STACKFRAME for first call
	STACKFRAME64 s; // in/out stackframe
	memset(&s, 0, sizeof(s));
	DWORD imageType;
#ifdef _M_IX86
	// normally, call ImageNtHeader() and use machine info from PE header
	imageType = IMAGE_FILE_MACHINE_I386;
	s.AddrPC.Offset = c.Eip;
	s.AddrPC.Mode = AddrModeFlat;
	s.AddrFrame.Offset = c.Ebp;
	s.AddrFrame.Mode = AddrModeFlat;
	s.AddrStack.Offset = c.Esp;
	s.AddrStack.Mode = AddrModeFlat;
#elif _M_X64
	imageType = IMAGE_FILE_MACHINE_AMD64;
	s.AddrPC.Offset = c.Rip;
	s.AddrPC.Mode = AddrModeFlat;
	s.AddrFrame.Offset = c.Rsp;
	s.AddrFrame.Mode = AddrModeFlat;
	s.AddrStack.Offset = c.Rsp;
	s.AddrStack.Mode = AddrModeFlat;
#elif _M_IA64
	imageType = IMAGE_FILE_MACHINE_IA64;
	s.AddrPC.Offset = c.StIIP;
	s.AddrPC.Mode = AddrModeFlat;
	s.AddrFrame.Offset = c.IntSp;
	s.AddrFrame.Mode = AddrModeFlat;
	s.AddrBStore.Offset = c.RsBSP;
	s.AddrBStore.Mode = AddrModeFlat;
	s.AddrStack.Offset = c.IntSp;
	s.AddrStack.Mode = AddrModeFlat;
#else
#error "Platform not supported!"
#endif

	pSym = (IMAGEHLP_SYMBOL64*)malloc(sizeof(IMAGEHLP_SYMBOL64) + STACKWALK_MAX_NAMELEN);
	if (!pSym)
		goto cleanup; // not enough memory...
	memset(pSym, 0, sizeof(IMAGEHLP_SYMBOL64) + STACKWALK_MAX_NAMELEN);
	pSym->SizeOfStruct = sizeof(IMAGEHLP_SYMBOL64);
	pSym->MaxNameLength = STACKWALK_MAX_NAMELEN;

	memset(&Line, 0, sizeof(Line));
	Line.SizeOfStruct = sizeof(Line);

	memset(&Module, 0, sizeof(Module));
	Module.SizeOfStruct = sizeof(Module);

	for (frameNum = 0;; ++frameNum)
	{
		// get next stack frame (StackWalk64(), SymFunctionTableAccess64(), SymGetModuleBase64())
		// if this returns ERROR_INVALID_ADDRESS (487) or ERROR_NOACCESS (998), you can
		// assume that either you are done, or that the stack is so hosed that the next
		// deeper frame could not be found.
		// CONTEXT need not to be supplied if imageTyp is IMAGE_FILE_MACHINE_I386!
		if (!this->m_sw->pSW(imageType, this->m_hProcess, hThread, &s, &c, myReadProcMem,
			this->m_sw->pSFTA, this->m_sw->pSGMB, NULL))
		{
			// INFO: "StackWalk64" does not set "GetLastError"...
			this->OnDbgHelpErr("StackWalk64", 0, s.AddrPC.Offset);
			break;
		}

		csEntry.offset = s.AddrPC.Offset;
		csEntry.name[0] = 0;
		csEntry.undName[0] = 0;
		csEntry.undFullName[0] = 0;
		csEntry.offsetFromSmybol = 0;
		csEntry.offsetFromLine = 0;
		csEntry.lineFileName[0] = 0;
		csEntry.lineNumber = 0;
		csEntry.loadedImageName[0] = 0;
		csEntry.moduleName[0] = 0;
		if (s.AddrPC.Offset == s.AddrReturn.Offset)
		{
			if ((this->m_MaxRecursionCount > 0) && (curRecursionCount > m_MaxRecursionCount))
			{
				this->OnDbgHelpErr("StackWalk64-Endless-Callstack!", 0, s.AddrPC.Offset);
				break;
			}
			curRecursionCount++;
		}
		else
			curRecursionCount = 0;
		if (s.AddrPC.Offset != 0)
		{
			// we seem to have a valid PC
			// show procedure info (SymGetSymFromAddr64())
			if (this->m_sw->pSGSFA(this->m_hProcess, s.AddrPC.Offset, &(csEntry.offsetFromSmybol),
				pSym) != FALSE)
			{
				MyStrCpy(csEntry.name, STACKWALK_MAX_NAMELEN, pSym->Name);
				// UnDecorateSymbolName()
				this->m_sw->pUDSN(pSym->Name, csEntry.undName, STACKWALK_MAX_NAMELEN, UNDNAME_NAME_ONLY);
				this->m_sw->pUDSN(pSym->Name, csEntry.undFullName, STACKWALK_MAX_NAMELEN, UNDNAME_COMPLETE);
			}
			else
			{
				this->OnDbgHelpErr("SymGetSymFromAddr64", GetLastError(), s.AddrPC.Offset);
			}

			// show line number info, NT5.0-method (SymGetLineFromAddr64())
			if (this->m_sw->pSGLFA != NULL)
			{ // yes, we have SymGetLineFromAddr64()
				if (this->m_sw->pSGLFA(this->m_hProcess, s.AddrPC.Offset, &(csEntry.offsetFromLine),
					&Line) != FALSE)
				{
					csEntry.lineNumber = Line.LineNumber;
					MyStrCpy(csEntry.lineFileName, STACKWALK_MAX_NAMELEN, Line.FileName);
				}
				else
				{
					this->OnDbgHelpErr("SymGetLineFromAddr64", GetLastError(), s.AddrPC.Offset);
				}
			} // yes, we have SymGetLineFromAddr64()

			// show module info (SymGetModuleInfo64())
			if (this->m_sw->GetModuleInfo(this->m_hProcess, s.AddrPC.Offset, &Module) != FALSE)
			{ // got module info OK
				switch (Module.SymType)
				{
				case SymNone:
					csEntry.symTypeString = "-nosymbols-";
					break;
				case SymCoff:
					csEntry.symTypeString = "COFF";
					break;
				case SymCv:
					csEntry.symTypeString = "CV";
					break;
				case SymPdb:
					csEntry.symTypeString = "PDB";
					break;
				case SymExport:
					csEntry.symTypeString = "-exported-";
					break;
				case SymDeferred:
					csEntry.symTypeString = "-deferred-";
					break;
				case SymSym:
					csEntry.symTypeString = "SYM";
					break;
#if API_VERSION_NUMBER >= 9
				case SymDia:
					csEntry.symTypeString = "DIA";
					break;
#endif
				case 8: //SymVirtual:
					csEntry.symTypeString = "Virtual";
					break;
				default:
					//_snprintf( ty, sizeof(ty), "symtype=%ld", (long) Module.SymType );
					csEntry.symTypeString = nullptr;
					break;
				}

				MyStrCpy(csEntry.moduleName, STACKWALK_MAX_NAMELEN, Module.ModuleName);
				csEntry.baseOfImage = Module.BaseOfImage;
				MyStrCpy(csEntry.loadedImageName, STACKWALK_MAX_NAMELEN, Module.LoadedImageName);
			} // got module info OK
			else
			{
				this->OnDbgHelpErr("SymGetModuleInfo64", GetLastError(), s.AddrPC.Offset);
			}
		} // we seem to have a valid PC

		CallstackEntryType et = nextEntry;
		if (frameNum == 0)
			et = firstEntry;
		bLastEntryCalled = false;
		this->OnCallstackEntry(et, csEntry);

		if (s.AddrReturn.Offset == 0)
		{
			bLastEntryCalled = true;
			this->OnCallstackEntry(lastEntry, csEntry);
			SetLastError(ERROR_SUCCESS);
			break;
		}
	} // for ( frameNum )

cleanup:
	if (pSym)
		free(pSym);

	if (bLastEntryCalled == false)
		this->OnCallstackEntry(lastEntry, csEntry);

	if (context == NULL)
		ResumeThread(hThread);

	return TRUE;
}

BOOL StackWalker::ShowObject(LPVOID pObject)
{
	// Load modules if not done yet
	if (m_modulesLoaded == FALSE)
		this->LoadModules(); // ignore the result...

	  // Verify that the DebugHelp.dll was actually found
	if (this->m_sw->m_hDbhHelp == NULL)
	{
		SetLastError(ERROR_DLL_INIT_FAILED);
		return FALSE;
	}

	// SymGetSymFromAddr64() is required
	if (this->m_sw->pSGSFA == NULL)
		return FALSE;

	// Show object info (SymGetSymFromAddr64())
	DWORD64            dwAddress = DWORD64(pObject);
	DWORD64            dwDisplacement = 0;
	IMAGEHLP_SYMBOL64* pSym =
		(IMAGEHLP_SYMBOL64*)malloc(sizeof(IMAGEHLP_SYMBOL64) + STACKWALK_MAX_NAMELEN);
	memset(pSym, 0, sizeof(IMAGEHLP_SYMBOL64) + STACKWALK_MAX_NAMELEN);
	pSym->SizeOfStruct = sizeof(IMAGEHLP_SYMBOL64);
	pSym->MaxNameLength = STACKWALK_MAX_NAMELEN;
	if (this->m_sw->pSGSFA(this->m_hProcess, dwAddress, &dwDisplacement, pSym) == FALSE)
	{
		this->OnDbgHelpErr("SymGetSymFromAddr64", GetLastError(), dwAddress);
		return FALSE;
	}
	// Object name output
	this->OnOutput(pSym->Name);

	free(pSym);
	return TRUE;
};

BOOL __stdcall StackWalker::myReadProcMem(HANDLE  hProcess,
	DWORD64 qwBaseAddress,
	PVOID   lpBuffer,
	DWORD   nSize,
	LPDWORD lpNumberOfBytesRead)
{
	if (s_readMemoryFunction == NULL)
	{
		SIZE_T st;
		BOOL   bRet = ReadProcessMemory(hProcess, (LPVOID)qwBaseAddress, lpBuffer, nSize, &st);
		*lpNumberOfBytesRead = (DWORD)st;
		//printf("ReadMemory: hProcess: %p, baseAddr: %p, buffer: %p, size: %d, read: %d, result: %d\n", hProcess, (LPVOID) qwBaseAddress, lpBuffer, nSize, (DWORD) st, (DWORD) bRet);
		return bRet;
	}
	else
	{
		return s_readMemoryFunction(hProcess, qwBaseAddress, lpBuffer, nSize, lpNumberOfBytesRead,
			s_readMemoryFunction_UserData);
	}
}

void StackWalker::OnLoadModule(LPCSTR    img,
	LPCSTR    mod,
	DWORD64   baseAddr,
	DWORD     size,
	DWORD     result,
	LPCSTR    symType,
	LPCSTR    pdbName,
	ULONGLONG fileVersion)
{
	CHAR   buffer[STACKWALK_MAX_NAMELEN];
	size_t maxLen = STACKWALK_MAX_NAMELEN;
#if _MSC_VER >= 1400
	maxLen = _TRUNCATE;
#endif
	if (fileVersion == 0)
		_snprintf_s(buffer, maxLen, "%s:%s (%p), size: %d (result: %d), SymType: '%s', PDB: '%s'\n",
			img, mod, (LPVOID)baseAddr, size, result, symType, pdbName);
	else
	{
		DWORD v4 = (DWORD)(fileVersion & 0xFFFF);
		DWORD v3 = (DWORD)((fileVersion >> 16) & 0xFFFF);
		DWORD v2 = (DWORD)((fileVersion >> 32) & 0xFFFF);
		DWORD v1 = (DWORD)((fileVersion >> 48) & 0xFFFF);
		_snprintf_s(
			buffer, maxLen,
			"%s:%s (%p), size: %d (result: %d), SymType: '%s', PDB: '%s', fileVersion: %d.%d.%d.%d\n",
			img, mod, (LPVOID)baseAddr, size, result, symType, pdbName, v1, v2, v3, v4);
	}
	buffer[STACKWALK_MAX_NAMELEN - 1] = 0; // be sure it is NULL terminated
	OnOutput(buffer);
}

void StackWalker::OnCallstackEntry(CallstackEntryType eType, CallstackEntry& entry)
{
	CHAR   buffer[STACKWALK_MAX_NAMELEN];
	size_t maxLen = STACKWALK_MAX_NAMELEN;
#if _MSC_VER >= 1400
	maxLen = _TRUNCATE;
#endif
	if ((eType != lastEntry) && (entry.offset != 0))
	{
		if (entry.name[0] == 0)
			MyStrCpy(entry.name, STACKWALK_MAX_NAMELEN, "(function-name not available)");
		if (entry.undName[0] != 0)
			MyStrCpy(entry.name, STACKWALK_MAX_NAMELEN, entry.undName);
		if (entry.undFullName[0] != 0)
			MyStrCpy(entry.name, STACKWALK_MAX_NAMELEN, entry.undFullName);
		if (entry.lineFileName[0] == 0)
		{
			MyStrCpy(entry.lineFileName, STACKWALK_MAX_NAMELEN, "()");
			if (entry.moduleName[0] == 0)
				MyStrCpy(entry.moduleName, STACKWALK_MAX_NAMELEN, "(module-name not available)");
			_snprintf_s(buffer, maxLen, "%-16s %p: %s: %s",
				entry.moduleName, (LPVOID)entry.offset, entry.lineFileName, entry.name);
		}
		else
			_snprintf_s(buffer, maxLen, "%-16s %s:%d: %s",
				entry.moduleName, entry.lineFileName, entry.lineNumber, entry.name);
		buffer[STACKWALK_MAX_NAMELEN - 1] = 0;
		OnOutput(buffer);
	}
}

void StackWalker::OnDbgHelpErr(LPCSTR szFuncName, DWORD gle, DWORD64 addr)
{
	CHAR   buffer[STACKWALK_MAX_NAMELEN];
	size_t maxLen = STACKWALK_MAX_NAMELEN;
#if _MSC_VER >= 1400
	maxLen = _TRUNCATE;
#endif
	_snprintf_s(buffer, maxLen, "ERROR: %s, GetLastError: %d (Address: %p)\n", szFuncName, gle,
		(LPVOID)addr);
	buffer[STACKWALK_MAX_NAMELEN - 1] = 0;
	OnOutput(buffer);
}

void StackWalker::OnSymInit(LPCSTR szSearchPath, DWORD symOptions, LPCSTR szUserName)
{
	CHAR   buffer[STACKWALK_MAX_NAMELEN];
	size_t maxLen = STACKWALK_MAX_NAMELEN;
#if _MSC_VER >= 1400
	maxLen = _TRUNCATE;
#endif
	_snprintf_s(buffer, maxLen, "SymInit: Symbol-SearchPath: '%s', symOptions: %d, UserName: '%s'\n",
		szSearchPath, symOptions, szUserName);
	buffer[STACKWALK_MAX_NAMELEN - 1] = 0;
	OnOutput(buffer);
	// Also display the OS-version
#if _MSC_VER <= 1200
	OSVERSIONINFOA ver;
	ZeroMemory(&ver, sizeof(OSVERSIONINFOA));
	ver.dwOSVersionInfoSize = sizeof(ver);
	if (GetVersionExA(&ver) != FALSE)
	{
		_snprintf_s(buffer, maxLen, "OS-Version: %d.%d.%d (%s)\n", ver.dwMajorVersion,
			ver.dwMinorVersion, ver.dwBuildNumber, ver.szCSDVersion);
		buffer[STACKWALK_MAX_NAMELEN - 1] = 0;
		OnOutput(buffer);
	}
#else
	OSVERSIONINFOEXA ver;
	ZeroMemory(&ver, sizeof(OSVERSIONINFOEXA));
	ver.dwOSVersionInfoSize = sizeof(ver);
#if _MSC_VER >= 1900
#pragma warning(push)
#pragma warning(disable : 4996)
#endif
	if (GetVersionExA((OSVERSIONINFOA*)&ver) != FALSE)
	{
		_snprintf_s(buffer, maxLen, "OS-Version: %d.%d.%d (%s) 0x%x-0x%x\n", ver.dwMajorVersion,
			ver.dwMinorVersion, ver.dwBuildNumber, ver.szCSDVersion, ver.wSuiteMask,
			ver.wProductType);
		buffer[STACKWALK_MAX_NAMELEN - 1] = 0;
		OnOutput(buffer);
	}
#if _MSC_VER >= 1900
#pragma warning(pop)
#endif
#endif
}

void StackWalker::OnOutput(LPCSTR buffer)
{
	m_logger(buffer);
}

#endif
